Joe Mazzello Cast in Key Justified Season 4 Role

The actor, most recently seen on A&E's Coma, will appear on multiple episodes of this FX drama as Billy St. Cyr, a local preacher who helps residents kick their drug habits. Look for the character to clash with Walton Goggins' Boyd because, well, he sells drugs.

Justified returns in January with new episodes and will also feature Patton Oswalt as a constable who helps Raylan out, and Ron Eldard as a veteran who teams up with Raylan.